body{
    display: flex;
    justify-content: center;
    background-color: rgb(164, 170 , 206);
}
.warp{
    width: 1000px;
    position: relative;
    top: 100px;
}
.warp::after{
    content: "";
    position: absolute;
    top: -100px;
    left: 50%;
    width: 5px;
    height: 1000px;
    z-index: -999;
    background-color: cadetblue;
}
.box{
    position: relative;
    width: 100%;
    height: 120px;
    margin-bottom: 50px;
    display: flex;
    justify-content: space-between;
}
.box .left,
.box .right{
    position: relative;
    width: 40%;
    height: 120px;
    border-radius: 15px;
    text-align: center;
    color: saddlebrown;
    padding: 10px;
}
.box:nth-child(even) .left{
    background-color: thistle;
    box-shadow: violet;
}
.box:nth-child(odd) .right{
    background-color: thistle;
    box-shadow: violet;
}
.box .center{
width: 15%;
display: flex;
justify-content: center;
align-items: center;

}
.box .center span{
    width: 120px;
    border-radius: 10px;
    text-align: center;
    font: 900 24px;
    line-height: 50px;
background-color: #fff;

}



